It's an anime that everyone would enjoy. If you loved Eden of the East and Elfen Lied, then you would love Mirai Nikki too. The ending left me all curious and with a lot of thoughts.
Story: Very entertaining plot twists, something like a japanese version of Hunger Games. Anyway, it's a game and only 1 person out of 12 can survive and take the place of God. That's what makes the story so good and addicting.
Characters: The side-cast in particular really needs a long while to get going, but in the end, the character development is pretty good all around. There is a lot of romance going on between the 2 main characters. Anymore, you'll have to find out yourself :)
Enjoyment: I enjoyed it so much, that it just kept me going without stopping.
Overall: Overall, it's a good one. I've watched so much anime and I think this deserves to be in my top list. I did not regret the time spent. It's my first review so I hope you guys liked it and if you are wondering if you should watch this anime, spend no more time thinking!